What is A3 size in cm?

On this page we answer the following question: What is A3 size in cm? Look here if you want to know what the A3 size in mm or the A3 size in inches.

The most commonly used paper size of all. In Europe and Japan at least. Because outside Japan they use a different size: the US Letter. The Letter is slightly wider and shorter in size than the A3 size. But what are the dimensions of A3 size in cm? You can read it below.

Dimensions A3 size in cm


An A3 size in cm has a width of 42 cm and a length of 29,7 cm.

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The weight of A3 size paper

When ordering printed matter, you are often asked how many grams of paper you want the calendar, menu or brochure printed on. Quite a tricky question. That’s why it’s good to know that in most cases the weight also determines the thickness of the paper. The heavier the number of grams, the thicker the paper often is. And the more luxurious the appearance of your product.

For printing paper we actually always use 80 grams A0 paper. This does not mean that an A0 paper weighs 80 grams. The name is derived from how much 1 m² of paper (A0 size paper) weighs. An 80 gram A3 paper weighs 10 grams.

What does the 3 stand for in A3 paper?

The 3 from the size represents the number of times the A0 size is halved. So an A3 size fits 3 times in the A0 size (which has a surface area of 1m²).

Overview of the A-Series in centimetres

Size Centimeter
4A0 168.2 x 237.8
2A0 118.9 x 168.2
A0 84.1 x 118.9
A1 59.4 x 84.1
A2 42.0 x 59.4
A3 29.7 x 42.0
A4 21.0 x 29.7
A5 14.8 x 21.0
A6 10.5 x 14.8
A7 7.4 x 10.5
A8 5.2 x 7.4
A9 3.7 x 5.2
A10 2.6 x 3.7